Interesting. Pioneer's MCACC doesn't really EQ the sub. It only uses parametric attenuation filters to notch out frequencies which build up in the room due to standing waves. It then may apply a little positive "trim" to the over-all signal (I've never seen more than +3 dB) to get the best possible average level.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris